Reply To: The Riddle Thread…. Home › Forums › Decaffeinated Coffee › The Riddle Thread…. › Reply To: The Riddle Thread…. October 27, 2010 6:24 pm at 6:24 pm #1069364 Dr. PepperParticipant There sure is a standard deviation. (Given parameters m and q the standard deviation is (m * q * (1-q) )^.5)